EP3627377B1 - Method for reading indicia off a display of a mobile device - Google Patents

Method for reading indicia off a display of a mobile device Download PDF

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Publication number
EP3627377B1
EP3627377B1 EP19209286.4A EP19209286A EP3627377B1 EP 3627377 B1 EP3627377 B1 EP 3627377B1 EP 19209286 A EP19209286 A EP 19209286A EP 3627377 B1 EP3627377 B1 EP 3627377B1
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EP
European Patent Office
Prior art keywords
mobile device
scanner
illuminating
images
captured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19209286.4A
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German (de)
French (fr)
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EP3627377A1 (en
Inventor
Erik Todeschini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hand Held Products Inc
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Hand Held Products Inc
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Publication date
Application filed by Hand Held Products Inc filed Critical Hand Held Products Inc
Priority to EP22212942.1A priority Critical patent/EP4181012A1/en
Publication of EP3627377A1 publication Critical patent/EP3627377A1/en
Application granted granted Critical
Publication of EP3627377B1 publication Critical patent/EP3627377B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

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    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/146—Methods for optical code recognition the method including quality enhancement steps
    • G06K7/1478—Methods for optical code recognition the method including quality enhancement steps adapting the threshold for pixels in a CMOS or CCD pixel sensor for black and white recognition
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10841—Particularities of the light-sensitive elements
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    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
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    • G06K7/10712—Fixed beam scanning
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    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms
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    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/1095—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices the scanner comprising adaptations for scanning a record carrier that is displayed on a display-screen or the like
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    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
    • G06K7/1413—1D bar codes
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    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
    • G06K7/1417—2D bar codes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
    • G06K7/1447—Methods for optical code recognition including a method step for retrieval of the optical code extracting optical codes from image or text carrying said optical code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/30—Payment architectures, schemes or protocols characterised by the use of specific devices or networks
    • G06Q20/32—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using wireless devices
    • G06Q20/327—Short range or proximity payments by means of M-devices
    • G06Q20/3274—Short range or proximity payments by means of M-devices using a pictured code, e.g. barcode or QR-code, being displayed on the M-device
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/30—Payment architectures, schemes or protocols characterised by the use of specific devices or networks
    • G06Q20/32—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using wireless devices
    • G06Q20/327—Short range or proximity payments by means of M-devices
    • G06Q20/3276—Short range or proximity payments by means of M-devices using a pictured code, e.g. barcode or QR-code, being read by the M-device
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00—Specific applications
    • G09G2380/04—Electronic labels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory

Definitions

  • the present invention relates to method of scanning and reading indicia of a display. More particularly, the present invention utilizing a light sensor of a mobile device to improve the quality of reading indicia, such as a barcode, on a display.
  • a barcode off the screen of a mobile device such as a smartphone.
  • the use cases may include reading mobile coupons, loyalty cards or other use cases.
  • the illumination from a scanner can cause reflection on the screen that may make it difficult for the scanner to read the barcode.
  • the backlight intensity on the smartphone may be dimmed which may make it difficult to read due to a lack of contrast.
  • US 2012/193429 discloses an indicia reading terminal that eliminates unwanted flickering effects in an illuminated screen reading mode.
  • the indicia reading terminal in response to a screen reading signal, is operative to activate a screen reading cycle, wherein an imaging subsystem is activated at least once at the same time that an illumination subsystem is activated for one of a plurality of active illumination periods, for a first illuminated exposure period.
  • the present invention embraces a method of scanning and reading indicia of a display.
  • the present invention utilizing the light sensor of a mobile device to improve the quality of reading indicia on a display.
  • the mobile device may be a smartphone and the indicia may be a barcode
  • a barcode reader may be an electronic device that can read and output printed barcodes to a computer. It may consist of a light source, a lens, and a light sensor translating optical impulses into electrical pulses. Barcode readers may contain decoder circuitry that analyzes the barcode's image data provided by the sensor and sends the barcode's content to the scanner's output port.
  • a barcode may be used to encode information in a visual pattern readable by a machine. Barcodes may be used for a variety of reasons including tracking products, prices, and stock levels for centralized recording in a computer software system. There are two types of barcodes - linear and 2D.
  • barcode scanners may consist of three different parts: the illumination system, the sensor, and the decoder.
  • a barcode scanner "scans" black and white elements of a barcode by illuminating the code with a light, which is then converted into matching text.
  • the sensor in the barcode scanner may detect the reflected light from the illumination system and generate a sensor stream reflecting the captured image of the barcode.
  • the sensor stream is sent to the decoder.
  • the decoder processes the frames of the sensor stream, validates the barcode, and coverts it into text. This converted text may be delivered by the scanner to a computer software system holding a database of the maker, cost, and quantity of products sold.
  • the present invention may take advantage of the light sensor found on the front of many smartphones on the market.
  • One traditional use of this sensor is to detect the amount of light in a room so that the backlight intensity of the smartphone may be adjusted accordingly to conserve battery.
  • the backlight intensity When in a brightly lit environment, the backlight intensity may be at full brightness to maximize readability and when the device is in a darker environment, the backlight intensity may be dimmed to conserve battery.
  • the latter use case may usually be an auto-brightness setting on the smartphone that allows these operations. Auto-brightness may be on by default and this function helps to conserve battery life.
  • the present invention describes a scan mode that when enabled will turn on the illumination of the scanner for a period of time, for example 500 milliseconds.
  • the scanner can flood the smartphone's light sensor with light, thus tricking the smartphone into thinking it is in a brightly lit environment.
  • This action may cause the smartphone to increase its backlight intensity on its display to a maximum brightness level that the mobile device is capable of emitting during the period of time, thus maximize the contrast of the barcode on the screen.
  • the scanner may turn off illumination and read the high contrast barcode on the smartphone screen.
  • the scan mode may be enabled in a variety of ways such as via command from host application, a programming barcode, a double trigger pull, a hardware button on the scanner, an inertial sensor recognized gesture (e.g. shaking side to side) or by recognizing a smartphone in the field of view via image processing techniques.
  • the scanner may try to first decode a few frames without any illumination. If this decoding is not successful, the scanner may turn on its illumination at full power for duration of time. This duration of time could be hardcoded to a set duration or could be left on until the software recognized a change in the brightness of the screen and then the illumination may be turned off. If a change in brightness is not detected, then a timeout period would also turn it off.
  • the scanner may attempt to decode frames while the illumination is on, but the scanner most likely would have a better chance of reading the code when the illumination turned off and the backlight was fully lit.
  • the screen may have a high contract that may improve the ability of the scanner to decode the captured frames (i.e. images).
  • Another possible mode of operation may be the illumination staying on for duration of time and briefly turn off while a few frames are attempted to be decoded (only a few milliseconds). This cycle would continue until the code was decoded. This flicker would barely be visible to the user and to the light sensor but would allow us to constantly flood the light sensor with light while simultaneously attempting to decode the captured images. This case may be the optimal manifestation of the present invention.
  • the invention assumes that the auto-brightness setting is enabled on the target device
  • the present invention includes at least two scenarios.
  • the scanner may actually perform image processing on the sensor video stream to detect when there has been a change in backlight intensity.
  • the scanner may do these functions by averaging the values of pixels in the frame and when the average rises by more than n from the previous frame(s) the scanner would stop flooding the smartphone with light and begin to decode.
  • Another scenario may be that the scanner floods the smartphone with light for a period of time and then simply assumes that it has tricked the smartphone into turning up its backlight intensity. At this point it would stop illuminating, attempt to decode a few frames and if unsuccessful would repeat this cycle.
  • Figure 1 illustrates a scanner 102 and a mobile device 104, where the scanner 102 is scanning a barcode on the mobile device 104.
  • Scanner 102 includes the functions of illumination, a sensor, and a decoder.
  • Figure 1 also illustrates mobile device 106 that is in a fully backlit environment, resulting in a high contrast display.
  • mobile device 108 illustrates a dimmed backlight environment that results in a low contrast display.
  • Scanner 102 may have improved performance scanning a high contrast display such as shown in mobile device 106, as compared to a low contrast display as show in mobile device 108.
  • Mobile devices 104, 106 and 108 determine the level of contrast based on the amount of light received by the light sensor. The sensor is depicted on mobile device 108.
  • a light sensor may be located on many smartphone.
  • Figure 2 illustrates a flowchart for a method of scanning and reading indicia on a display associated with a mobile device.
  • a scan mode is initiated for capturing images on a display of a mobile device, (step 204)
  • the scanner then illuminates the mobile device for a period of time. (step 210)
  • the backlight intensity of the display may increase in brightness, as compared to the backlight intensity prior to the illuminating of the mobile device, and eventually increase to a level of maximum brightness that the mobile device is capable of emitting during the time period.
  • step 212 When the period of time ends, the scanner ceases to illuminate the mobile device, and then captures images off the display, during a period of a high contrast display as illustrated on mobile device 106. The scanner then attempts to decode the captured images. (step 214). By scanning the display image immediately after the transition from a highly lit environment to a lowly lit environment, the images are captured from a high contract display which increases the probability of successfully decoding the captured images.
  • Figure 3 illustrates a flowchart for a method of scanning and reading indicia on a display associated with a mobile device.
  • a scan mode is initiated for capturing images on a display of a mobile device, (step 304)
  • the scanner attempts to capture a first set of captured images in a first time period without illuminating the mobile device. (step 306)
  • the hand-held scanner may be in motion, so the scanner may scan a few frames in order to optimize the possibility of obtaining an image that is in focus.
  • the decoded image is sent to a computer. If the captured image is successfully decoded before the end of the first time period, then the decoded image is sent to a computer. If the captured image is not successfully decoded before the end of the first time period, then the scanner illuminates the mobile device for a second time period. (step 310) Next, while the mobile device is illuminated, the scanner attempts to decode a second set of captured images that were scanned during a first portion of the second time period. (step 311) If the decoding is successful, the decoded image is set to a computer. If the decoding is not successful, the method continues.
  • the scanner Since the scanner is illuminating the mobile device, including its light sensor, the brightness of the backlight intensity may continue to increase until the backlight intensity as compared to the backlight intensity prior to the illuminating of the mobile device, and may reach a maximum brightness level that the mobile device is capable of emitting in the second time period. (step 312) When the second time period ends, the scanner ceases to illuminate the mobile device. Without the illumination, the scanner captures a third set of images off the display and subsequently attempts to decode the third set of captured images. (step 316) If the third set of captured images is successfully decoded, the decoded image is sent to a computer.
  • the scanner illuminates the mobile device for another second time period.
  • the method then repeats the steps of the second time period including steps 310, 311, 312, and 316.
  • Figure 4A and figure 4B illustrates a flowchart for a method of scanning and reading indicia on a display associated with a mobile device.
  • a scan mode is initiated for capturing images on a display of a mobile device.
  • the scanner attempts to decode a first set of captured images in a first time period without illuminating the mobile device. (step 406)
  • the hand-held scanner may be in motion, so the scanner may scan a few frames in order to optimize the possibility of obtaining an image that is in focus.
  • the decoded image is sent to a computer. If the first set of captured imaged is successfully decoded before the end of the first time period, then the decoded image is sent to a computer. If the first set of captured images is not successfully decoded before the end of the first time period, then the scanner illuminates the mobile device for a second time period. (step 410) Next, while the mobile device is illuminated, the scanner attempts to decode a second set of captured images that were scanned after the mobile device was illuminated. If the decoding is successful, the decoded image is sent to a computer (step 411).
  • the scanner monitors the change in the level of backlight intensity of the display of the mobile device.
  • the scanner determines if the backlight intensity increases to a level greater than a predetermined level as compared to a previous measurement. (step 415) If the predetermined level is achieved, then the scanner ceases illuminating the mobile device.
  • the scanner then captures images off the display and subsequently attempts to decode a third set of captured images, (step 416) If the decoding is successful, then the decoded image is sent to a computer.
  • the method repeats the steps 411, 414, 415, 416.
  • step 415 If the backlight intensity of the display in step 415 has not increased by more than the predetermined level as compared with another previous measurement, the scanner continues to illuminate the mobile device until the backlight intensity is greater than the predetermined level as compared with a previous measurement. (step 412)
  • Figure 3 disclose a method where the decisions to attempt to decode captured images are based on certain time periods.
  • Figures 4A and 4B disclose a method where the decisions to attempt to decode captured images are based on a change in the level of brightness of the display.
  • One skilled in the art may recognize that the methods described in Figure 3 and figures 4A and 4B may be combined.

Description

    FIELD OF THE INVENTION
  • The present invention relates to method of scanning and reading indicia of a display. More particularly, the present invention utilizing a light sensor of a mobile device to improve the quality of reading indicia, such as a barcode, on a display.
    • BACKGROUND
  • Generally speaking, traditional point of sales systems have the ability to read a barcode off the screen of a mobile device, such as a smartphone. The use cases may include reading mobile coupons, loyalty cards or other use cases. It may be difficult for traditional 1D or 2D barcode scanners to read barcodes off the screen of a smartphone, as these barcode scanners are not optimized these applications. For example, the illumination from a scanner can cause reflection on the screen that may make it difficult for the scanner to read the barcode. Moreover, the backlight intensity on the smartphone may be dimmed which may make it difficult to read due to a lack of contrast.
  • Therefore, a need exists to improve the ability of traditional scanners to read indicia from the screen of a mobile device, such as a smartphone.
  • US 2012/193429 discloses an indicia reading terminal that eliminates unwanted flickering effects in an illuminated screen reading mode. The indicia reading terminal, in response to a screen reading signal, is operative to activate a screen reading cycle, wherein an imaging subsystem is activated at least once at the same time that an illumination subsystem is activated for one of a plurality of active illumination periods, for a first illuminated exposure period.
    • SUMMARY
  • There is disclosed herein a method of scanning and reading indicia on a display associated with a mobile device, such as a smartphone. Indicia may be a barcode. The present invention is defined by the appended independent claim. Particular embodiments are defined by the dependent claims.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Figure 1 graphically depicts a scanner and a mobile device, including where the scanner is scanning a barcode on a mobile device.
    • Figure 2 depicts a flowchart of an example method of scanning and reading indicia on a display associated with a mobile device.
    • Figure 3 depicts flowchart of another example method of scanning and reading indicia on a display associated with a mobile device.
    • Figure 4A, 4B depict flowcharts of an exemplary embodiment for a method of scanning and reading indicia on a display associated with a mobile device.
    DETAILED DESCRIPTION
  • The present invention embraces a method of scanning and reading indicia of a display. The present invention utilizing the light sensor of a mobile device to improve the quality of reading indicia on a display. In a typical application, the mobile device may be a smartphone and the indicia may be a barcode
  • A barcode reader (or barcode scanner) may be an electronic device that can read and output printed barcodes to a computer. It may consist of a light source, a lens, and a light sensor translating optical impulses into electrical pulses. Barcode readers may contain decoder circuitry that analyzes the barcode's image data provided by the sensor and sends the barcode's content to the scanner's output port.
  • A barcode may be used to encode information in a visual pattern readable by a machine. Barcodes may be used for a variety of reasons including tracking products, prices, and stock levels for centralized recording in a computer software system. There are two types of barcodes - linear and 2D.
  • Most barcode scanners may consist of three different parts: the illumination system, the sensor, and the decoder. In general, a barcode scanner "scans" black and white elements of a barcode by illuminating the code with a light, which is then converted into matching text. More specifically, the sensor in the barcode scanner may detect the reflected light from the illumination system and generate a sensor stream reflecting the captured image of the barcode. The sensor stream is sent to the decoder. The decoder processes the frames of the sensor stream, validates the barcode, and coverts it into text. This converted text may be delivered by the scanner to a computer software system holding a database of the maker, cost, and quantity of products sold.
  • The present invention may take advantage of the light sensor found on the front of many smartphones on the market. One traditional use of this sensor is to detect the amount of light in a room so that the backlight intensity of the smartphone may be adjusted accordingly to conserve battery. When in a brightly lit environment, the backlight intensity may be at full brightness to maximize readability and when the device is in a darker environment, the backlight intensity may be dimmed to conserve battery. The latter use case may usually be an auto-brightness setting on the smartphone that allows these operations. Auto-brightness may be on by default and this function helps to conserve battery life.
  • The present invention describes a scan mode that when enabled will turn on the illumination of the scanner for a period of time, for example 500 milliseconds. During this period, the scanner can flood the smartphone's light sensor with light, thus tricking the smartphone into thinking it is in a brightly lit environment. This action may cause the smartphone to increase its backlight intensity on its display to a maximum brightness level that the mobile device is capable of emitting during the period of time, thus maximize the contrast of the barcode on the screen. At this point the scanner may turn off illumination and read the high contrast barcode on the smartphone screen.
  • The scan mode may be enabled in a variety of ways such as via command from host application, a programming barcode, a double trigger pull, a hardware button on the scanner, an inertial sensor recognized gesture (e.g. shaking side to side) or by recognizing a smartphone in the field of view via image processing techniques. Once this scan mode is enabled, the scanner may try to first decode a few frames without any illumination. If this decoding is not successful, the scanner may turn on its illumination at full power for duration of time. This duration of time could be hardcoded to a set duration or could be left on until the software recognized a change in the brightness of the screen and then the illumination may be turned off. If a change in brightness is not detected, then a timeout period would also turn it off. The scanner may attempt to decode frames while the illumination is on, but the scanner most likely would have a better chance of reading the code when the illumination turned off and the backlight was fully lit. In this case, the screen may have a high contract that may improve the ability of the scanner to decode the captured frames (i.e. images). Another possible mode of operation may be the illumination staying on for duration of time and briefly turn off while a few frames are attempted to be decoded (only a few milliseconds). This cycle would continue until the code was decoded. This flicker would barely be visible to the user and to the light sensor but would allow us to constantly flood the light sensor with light while simultaneously attempting to decode the captured images. This case may be the optimal manifestation of the present invention. The invention assumes that the auto-brightness setting is enabled on the target device
  • In summary, the present invention includes at least two scenarios. In one scenario, while flooding the smartphone with light the scanner may actually perform image processing on the sensor video stream to detect when there has been a change in backlight intensity. The scanner may do these functions by averaging the values of pixels in the frame and when the average rises by more than n from the previous frame(s) the scanner would stop flooding the smartphone with light and begin to decode. Another scenario may be that the scanner floods the smartphone with light for a period of time and then simply assumes that it has tricked the smartphone into turning up its backlight intensity. At this point it would stop illuminating, attempt to decode a few frames and if unsuccessful would repeat this cycle.
  • Figure 1 illustrates a scanner 102 and a mobile device 104, where the scanner 102 is scanning a barcode on the mobile device 104. Scanner 102 includes the functions of illumination, a sensor, and a decoder. Figure 1 also illustrates mobile device 106 that is in a fully backlit environment, resulting in a high contrast display. Alternatively, mobile device 108 illustrates a dimmed backlight environment that results in a low contrast display. Scanner 102 may have improved performance scanning a high contrast display such as shown in mobile device 106, as compared to a low contrast display as show in mobile device 108. Mobile devices 104, 106 and 108 determine the level of contrast based on the amount of light received by the light sensor. The sensor is depicted on mobile device 108. A light sensor may be located on many smartphone.
  • In an example not directly embodying the present invention, Figure 2 illustrates a flowchart for a method of scanning and reading indicia on a display associated with a mobile device. Starting at a scanner (step 202), a scan mode is initiated for capturing images on a display of a mobile device, (step 204) The scanner then illuminates the mobile device for a period of time. (step 210) As previously discussed, when the light sensor of the mobile phone is flooded with light, the backlight intensity of the display may increase in brightness, as compared to the backlight intensity prior to the illuminating of the mobile device, and eventually increase to a level of maximum brightness that the mobile device is capable of emitting during the time period. (step 212) When the period of time ends, the scanner ceases to illuminate the mobile device, and then captures images off the display, during a period of a high contrast display as illustrated on mobile device 106. The scanner then attempts to decode the captured images. (step 214). By scanning the display image immediately after the transition from a highly lit environment to a lowly lit environment, the images are captured from a high contract display which increases the probability of successfully decoding the captured images.
  • In an example, Figure 3 illustrates a flowchart for a method of scanning and reading indicia on a display associated with a mobile device. Starting at a scanner (step 302), a scan mode is initiated for capturing images on a display of a mobile device, (step 304) The scanner then attempts to capture a first set of captured images in a first time period without illuminating the mobile device. (step 306) In these attempts, the hand-held scanner may be in motion, so the scanner may scan a few frames in order to optimize the possibility of obtaining an image that is in focus.
  • If the captured image is successfully decoded before the end of the first time period, then the decoded image is sent to a computer. If the captured image is not successfully decoded before the end of the first time period, then the scanner illuminates the mobile device for a second time period. (step 310) Next, while the mobile device is illuminated, the scanner attempts to decode a second set of captured images that were scanned during a first portion of the second time period. (step 311) If the decoding is successful, the decoded image is set to a computer. If the decoding is not successful, the method continues.
  • Since the scanner is illuminating the mobile device, including its light sensor, the brightness of the backlight intensity may continue to increase until the backlight intensity as compared to the backlight intensity prior to the illuminating of the mobile device, and may reach a maximum brightness level that the mobile device is capable of emitting in the second time period. (step 312) When the second time period ends, the scanner ceases to illuminate the mobile device. Without the illumination, the scanner captures a third set of images off the display and subsequently attempts to decode the third set of captured images. (step 316) If the third set of captured images is successfully decoded, the decoded image is sent to a computer.
  • If the decoding of the third set of captured images is not successful, the scanner illuminates the mobile device for another second time period. The method then repeats the steps of the second time period including steps 310, 311, 312, and 316.
  • In an exemplary embodiment, Figure 4A and figure 4B illustrates a flowchart for a method of scanning and reading indicia on a display associated with a mobile device. Starting at a scanner (step 402), a scan mode is initiated for capturing images on a display of a mobile device. (step 404)
  • The scanner then attempts to decode a first set of captured images in a first time period without illuminating the mobile device. (step 406) In these attempts, the hand-held scanner may be in motion, so the scanner may scan a few frames in order to optimize the possibility of obtaining an image that is in focus.
  • If the first set of captured imaged is successfully decoded before the end of the first time period, then the decoded image is sent to a computer. If the first set of captured images is not successfully decoded before the end of the first time period, then the scanner illuminates the mobile device for a second time period. (step 410) Next, while the mobile device is illuminated, the scanner attempts to decode a second set of captured images that were scanned after the mobile device was illuminated. If the decoding is successful, the decoded image is sent to a computer (step 411).
  • If the decoding is not successful, the scanner monitors the change in the level of backlight intensity of the display of the mobile device. The scanner determines if the backlight intensity increases to a level greater than a predetermined level as compared to a previous measurement. (step 415) If the predetermined level is achieved, then the scanner ceases illuminating the mobile device. The scanner then captures images off the display and subsequently attempts to decode a third set of captured images, (step 416) If the decoding is successful, then the decoded image is sent to a computer.
  • If the decoding is not successful, the method repeats the steps 411, 414, 415, 416.
  • If the backlight intensity of the display in step 415 has not increased by more than the predetermined level as compared with another previous measurement, the scanner continues to illuminate the mobile device until the backlight intensity is greater than the predetermined level as compared with a previous measurement. (step 412)
  • Figure 3 disclose a method where the decisions to attempt to decode captured images are based on certain time periods. Whereas, Figures 4A and 4B disclose a method where the decisions to attempt to decode captured images are based on a change in the level of brightness of the display. One skilled in the art may recognize that the methods described in Figure 3 and figures 4A and 4B may be combined.

Claims (7)

  1. A method comprising:
    initiating a scan mode (304; 404) of a scanner (102) to capture, with the scanner (102), a first set of images presented on a display associated with a mobile device (104) first without illuminating the mobile device (104);
    attempting to decode (306; 406) the first set of images captured without illuminating the mobile device;
    characterised by
    if the first set of images are not successfully decoded,
    illuminating (310; 410) the mobile device (104), with the scanner (102), until a change in brightness on the display associated with the mobile device is recognised by the scanner,
    ceasing (316; 416) illuminating the mobile device (104) and then
    capturing, with the scanner (102), further images of the display after ceasing illuminating the mobile device; and
    attempting to decode the further images.
  2. The method according to claim 1, wherein: while the mobile device is illuminated, the scanner attempts to scan and decode a second set of images.
  3. The method according to claim 1 or 2, comprising ceasing (316) illuminating the mobile device when a given time period of illuminating the mobile device ends.
  4. The method according to claim 1, 2 or 3, wherein:
    the captured images comprise one or more frames of data; and
    the method comprises:
    determining if an average value of pixels in a frame captured while illuminating the mobile device rises by more than a given amount n from that of a previous frame captured while illuminating the mobile device; and
    ceasing illuminating the mobile device when it is determined that the average value has risen by more than the given amount n.
  5. The method according to claim 1, 2 or 3, wherein:
    the captured images comprise one or more frames of data; and
    the method comprises a repeating cycle of:
    illuminating the mobile device; and then
    ceasing illuminating the mobile device while frames are attempted to be decoded.
  6. The method according to claim 5, comprising continuing the cycle until the decoding is successful.
  7. The method of any of the preceding claims, wherein the scan mode is initiated in response to:
    receiving a command from a host application;
    decoding a programming barcode;
    activation of hardware on the scanner (102);
    receiving a signal from an inertial sensor on the scanner (102); and/or
    processing an image captured by the scanner (102);
    wherein when the scan mode is enabled, the scanner (102) performs the steps of illuminating, ceasing illuminating, capturing images, and attempting to decode the captured images.
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EP3285198A3 (en) 2018-03-21
US10372954B2 (en) 2019-08-06
EP3285198B1 (en) 2020-03-18
EP4181012A1 (en) 2023-05-17
EP3627377A1 (en) 2020-03-25
US20180053027A1 (en) 2018-02-22
CN107766768B (en) 2022-12-13

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